The CCTV footage is said to show two thugs slipping into the room during the 45 minutes she was left alone on the day of her death.

Although the official coroner report ruled that the I Will Always Love You hitmaker accidentally drowned in a bathtub because of heart disease and chronic cocaine use, Huebl is adamant there was foul play.

He said: "Whitney's body shows classic defence wounds that would have occurred while she was battling for her life."

Huebl has passed the FBI a dossier of information and was hopeful there would be enough evidence to merit a fresh investigation into the star's death.

According to Huebl the 48-year-old Bodyguard actress received a cocaine delivery the day before her death and was overheard saying, "I'm tired of this s**t," referring to the debts she allegedly owed for the drugs.